JPS5923248B2 - Manufacturing method for decorative adhesive molded products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a decorative adhesive molded product, and an object thereof is to provide a manufacturing method that does not cause deterioration of the surface condition due to deformation of the decorative film on the surface during manufacturing. It is something to do.

It is generally known that a film is installed in a mold and molded and decorated, but when a thermoplastic resin such as vinyl chloride is used as the film material, for example, if it is installed in an injection mold and molded, injection molding occurs. Due to the heat and flow of the resin, the film partially melts and deforms, causing wrinkles and damage to the decorative printing pattern applied to the film, exposing the injected resin to the surface of the film, and sometimes causing the film to melt into the injected resin. It's not uncommon to get caught up in it.

In particular, there is a drawback that this phenomenon is more likely to occur as the thickness of the film becomes thinner. Furthermore, the surface condition of the film is partially affected by the heat of the injected resin, often resulting in uneven gloss. In order to compensate for this drawback, methods such as making the film adhere in a vacuum state within a mold have been considered, but in the case of complex shapes, perfect J adhesion is difficult, and the above-mentioned drawback becomes especially noticeable. There is. The present invention aims to provide a method for manufacturing decorative adhesive molded products free of the above-mentioned drawbacks, and examples of the present invention will be described below with reference to the drawings.

The present invention increases the heat deformation temperature of resins that thermoplastic at relatively low temperatures, such as vinyl chloride, by irradiating the synthetic resin film installed in the mold with ultraviolet rays at the same time as vacuum forming and crosslinking the internally added photosensitive components. This aims to make the film as less susceptible to the effects of heat and fluoro of the injected resin within the mold in which it is mounted, and to eliminate cosmetic defects that conventionally occur. First, the following formulation specifications are used for the synthetic resin film material.

Vinyl chloride resin: 100 parts DOP (plasticizer): 10 parts Stabilizer, etc.: 5 parts β-vinyloxyethyl acrylic: 10 parts Rate o Allyl acrylate: 5 parts Thermal polymerization inhibitor (mono-hydroquino: 0.1 part) (monomethyl ether) photopolymerization initiator (benzophene: 5 parts free) 5 After applying decorative printing such as a wood grain pattern on the front or back side of this film, it was molded using a vacuum molding mold with a shape almost similar to the injection molding mold described below. Then vacuum form the film.

At this time, the film is heated and softened with a heater, and at that time, an ultraviolet ray generating lamp is also installed along with the heater, and the photosensitive components in the film are cross-linked by irradiation with ultraviolet rays at the same time as the film is softened or after molding. By making it into a molded product, the heat deformation temperature of the film itself is improved.
The heat resistance (heat distortion temperature) of the vacuum-formed product manufactured by the above method can be freely set by changing the type and amount of crosslinking agent added.

In addition, a high-pressure mercury lamp was used as the ultraviolet light generating lamp. It is assumed that the film is irradiated with ultraviolet rays from the side opposite to the decorative surface of the film. After that, this film molded product is placed in an injection mold, and a thermoplastic resin such as pinyl chloride, styrene, ABS, etc. is injected using an injection molding machine and fused and integrated with the film molded product in the mold to perform molding. Complete. In this case, it is also necessary to consider coating one side of the film, that is, the surface that will be in contact with the injection resin, with a synthetic resin primer liquid before or after vacuum forming to improve adhesion with the injection resin, if necessary. . Figures 1 and 2
3 are diagrams showing the process of carrying out the method of manufacturing a decorative adhesive molded product of the present invention. As shown in FIG. Then, as shown in FIG. 2, heat is applied to soften the synthetic resin film 2, and then, as shown in FIG. Form into shape.

The specially mixed resin components in the synthetic resin film 2 are crosslinked by the ultraviolet rays at this time, and the synthetic resin film 2 becomes resistant to heat. The synthetic resin molded in this manner is put into an injection molding cavity 5, covered with one type of injection molding core, and molded by injecting the synthetic resin r from an injection molding machine. As described above, according to the present invention, it is possible to improve the thermal softening properties of the film installed in the mold and prevent the occurrence of defects due to the heat and flow of the injected resin, so even if the mold shape is complex, uniform makeup can be achieved. This has great industrial value, as it also reduces the need to adhere the resin film to the inner wall of the mold.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are principle diagrams of the manufacturing process of the method for manufacturing decorative adhesive molded products of the present invention. 1... Heater, 2... Synthetic resin film, 3... Vacuum mold, 4... Ultraviolet generator, 5... Injection Molding mold, 6...
Injection molding machine, r...Resin.

Claims (1)

[Claims] 1. A synthetic resin film whose surface has been painted is mixed with a resin component that undergoes a crosslinking reaction when irradiated with ultraviolet rays, and this synthetic resin film is molded into a predetermined shape and irradiated with ultraviolet rays. The above-mentioned resin component is crosslinked by crosslinking, and then the above-molded synthetic resin film is mounted in a mold, and the synthetic resin is placed in the mold and molded. Method. 2. The method for producing a decorative adhesive molded product according to claim 1, which comprises irradiating the synthetic resin film with ultraviolet rays at the same time as vacuum forming the synthetic resin film.